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Three's company for mama tiger

This photo, taken Sunday, March 9, 2014, shows Sumatran tiger Melati with her triplets.
Zoological Society of London/AP

LONDON - At London Zoo, good news has come in threes.

The zoo said Thursday that 5-year-old Sumatran tiger Melati has given birth to triplets, a little more than a year after the endangered tiger lost a 3-week-old cub.

London Zoo said the three cubs - whose sexes are not yet known - all arrived within an hour of each other early on Feb. 3.

The cubs' first moments have been captured on hidden cameras and zookeepers are monitoring the three around the clock.

Teague Stubbington, a zookeeper, said the cubs have hit several milestones including opening their eyes and taking tentative first steps, and that their personalities are starting to emerge.

Stubbington revealed that one has earned the nickname "Trouble" for being first to explore its den and also for waking up the other two cubs.

Sumatran tigers are listed as critically endangered on the International Union for Conservation of Nature's Red List of Threatened Animals.

This photo shows Sumatran tiger Melati with her as three cubs.
Zoological Society of London/AP